<template>
  <div class="app-container">
    <div><h2 style="text-align: center;">课程发布</h2></div>

    <div style="margin-left: 10%;margin-right: 10%;">
      <el-steps :active="3">
        <el-step title="课程基本信息"></el-step>
        <el-step title="课程大纲"></el-step>
        <el-step title="发布"></el-step>
      </el-steps>

    <el-form label-width="120px">

      <!--课程预览-->
      <div class="ccInfo">
        <img :src="coursePublishVo.cover">
        <div class="main">
          <h2>{{ coursePublishVo.title }}</h2>
          <p class="gray"><span>共{{ coursePublishVo.lessonNum }}课时</span></p>
          <p><span>所属分类：{{ coursePublishVo.subjectLevelOne }} -> {{ coursePublishVo.subjectLevelTwo }}</span></p>
          <p>课程讲师：{{ coursePublishVo.teacherName }}</p>
          <h3 class="red">￥{{ coursePublishVo.price }}</h3>
        </div>
      </div>

      <div>
        <el-button :disabled="saveBtnDisabled" plain="true" type="primary" @click="previous">上一步</el-button>
        <el-button :disabled="publishBtnDisabled" plain="true" type="primary" @click="publish">发布课程</el-button>
      </div>
    </el-form>
    </div>
  </div>
</template>
<script>
import course from "@/api/course";

  export default {
    data() {
      return {
        saveBtnDisabled: false, // 保存按钮是否禁用
        publishBtnDisabled: false, // 按钮是否禁用
        coursePublishVo:{
          title: '',
          cover: '',
          lessonNum: 0,
          subjectLevelOne: '',
          subjectLevelTwo: '',
          teacherName: '',
          price: 0
        } ,// 课程发布信息
        courseId: ''
      }
    },

    created() {
      if (this.$route.params && this.$route.params.id){
        this.courseId = this.$route.params.id
        this.fetchCoursePublishById(this.courseId)
      }
    },

    methods: {
      // 获取课程发布信息
      fetchCoursePublishById(id) {
        course.getCoursePublishVoById(id).then(response => {
          this.coursePublishVo = response.data.coursePublishVo
        })
      },

      previous(){
        this.$router.push({path:'/course/chapter/'+this.courseId})
      },
      publish(){
        course.publishCourseById(this.courseId)
          .then(response => {
            this.$message.success("发布成功")
            this.$router.push({path:'/course/list'})
          })
      }
    }
  }
</script>
<style>
  .ccInfo {
    background: #f5f5f5;
    padding: 20px;
    overflow: hidden;
    border: 1px dashed #DDD;
    margin-bottom: 40px;
    position: relative;
  }
  .ccInfo img {
    background: #d6d6d6;
    width: 240px;
    height: 300px;
    display: block;
    float: left;
    border: none;
  }
  .ccInfo .main {
    margin-left: 520px;
  }

  .ccInfo .main h2 {
    font-size: 28px;
    margin-bottom: 30px;
    line-height: 1;
    font-weight: normal;
  }
  .ccInfo .main p {
    margin-bottom: 10px;
    word-wrap: break-word;
    line-height: 24px;
    max-height: 48px;
    overflow: hidden;
  }

  .ccInfo .main p {
    margin-bottom: 10px;
    word-wrap: break-word;
    line-height: 24px;
    max-height: 48px;
    overflow: hidden;
  }
  .ccInfo .main h3 {
    left: 540px;
    bottom: 20px;
    line-height: 1;
    font-size: 28px;
    color: #d32f24;
    font-weight: normal;
    position: absolute;
  }
</style>
